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-21-
Model W1666/W1685 (For Machines Mfd. Since 2/15)
SETUP
Flexible.Duct
Flexible hose is generally used for short runs, small shops
and at rigid duct-to-tool connections. There are many
different types of flex hose on the market today. These
are manufactured from materials such as polyethylene,
PVC, cloth hose dipped in rubber and even metal,
including steel and aluminum.
The superior choice here is metal flex hose that is
designed to be flexible, yet be as smooth as possible to
reduce static pressure loss.
There are also many kinds of pure plastic flexible hose,
such as non-perforated drainage type hose and dryer vent
hose. Drainage type hose, while being economical, does
not quite have the flexibility required for dust collection.
The inside of the duct is also deeply corrugated and
can increase the static pressure loss by as much as 50%
over smooth wall duct. Dryer vent hose, while being
completely flexible, is non-resistant to abrasion and has
a tendency to collapse in a negative pressure system. We
DO NOT recommend using dryer vent hose in your dust
collection system.
If using flex-hose, you should choose one of the many
types that are designed specifically for the movement of
solid particles, i.e. dust, grains, and plastics. However, the
cost of specifically designed flexible duct can vary greatly.
Woodstock offers polyethylene hose, which is well suited
for the removal of particulate matter, especially sawdust,
since it is durable and completely flexible. Polyethylene
is also very economical and available in a wide variety of
diameters and lengths for most applications.
Figure.22. Example of flexible metal duct.
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